by Air of a warm Temperature. 313 



difference is still greater between the temperatnre of such a 

 sitting-room and the passages into other rooms. The me- 

 thod of warming houses by fires as above stated would never, 

 in all probability, have been employed, if the constructor had 

 been previously acquainted with the lav\ s of passage of heat 

 from one bi)dy to another body ; and inveterate custom and 

 prejudices can only account for so unreasonable a method. 

 It is true, Count Runiford, in particular, has occasioned im- 

 provements in the form of grates, to e.xtend the oscillating or 

 radiating property of heat and to save expense of fuel ; but 

 to render the air of every part of a large room, and every part 

 of a house, of nearly the same warm temperature, further 

 and different modes of building the house iiself must be in- 

 troduced. That this is ceconomically practicable is evident 

 from the mode of warming the air of manufactories, work- 

 shops, hot- houses, 8cc. All that is further requisite is, to 

 build a dwelling-house of such a form as to unite the ad- 

 vantages of dift'using heat by the several different modes of 

 its communication ; namely, oscillation, alteration of den- 

 sity of the portions of air with which it is in conuct, and 

 diffusion by elasticity or attraction from particle to particle 

 of air. The plan for such a building must be devised by 

 some ingenious architect, under the direction of a medical pro- 

 fessional man competently informed on the subject of the 

 philosophy which furnishes the principle. From the suc- 

 cess of ten years' practice, which has been produced by 

 warming rooms even by clumsy, rude and expensive contri- 

 vances in our present ill-suited houses, in the hands of a 

 physician who has furnished these observations, there seems 

 a certainty that the undertaking of such a building will be- 

 come profitable to the proprietor. The physician alluded to 

 would willingly incur the expense on this occasion, but it is 

 necessary that he should be precluded from the possibility of 

 pecuniary benefit. He is willii/g, however, to afford his 

 best assistance gratuitously, and of course to support, as 

 far as \n is able, the proprietor by his rcconunendation in 

 practice. 



The f ditcr of tliis work is authorised to give further in- 

 formation 



